I am running an ARM router with i2p and tor on it - a Netgear R7000.
Of course I've added a full 512 MB of SWAP to it to prevent OOMs, understanding that it could slow down the system... But then I ...

As root in a CentOs 6.4 server I got this error in an application:
Fri May 16 01:45:23 2014 Error: Terminating since out of inotify watches.
Consider increasing /proc/sys/fs/inotify/max_user_watches
...

The problem that we are facing is that some of the http connection have response time > 60s (about 5%).
I discover that the problem should between the web server and loadbalancer.
Here is my finding, ...

Ubuntu 12.04
I am trying to better understand how many times TCP will attempt to retransmit a packet when it does not receive confirmation the destination received it. After reading the tcp man page ...

I have a network of OpenVZ machines that I am testing various congestion control methods on. I need to know how to change the congestion control. Currently I get nothing but permission denied. Is it ...

I am trying to configure my Ubuntu 12.04 VPS (OpenVZ) to reboot when it runs out of memory. To do this I have added following lines to my "/etc/sysctl.conf" file.
vm.panic_on_oom = 1
kernel.panic = ...

I have a server running RHEL6.4.
I need to configure .rp_filter sysctl parameter for my server's private interconnect.
This server has 2 NICs bonded together.
I looked through the documentation and ...

Since some days, we're getting "Too Many Open Files" within an Java application while loading files. So i start searching on Google, and increased fs.file-max to 200000 in my /etc/sysctl.conf. After ...

I've done as much research as I could on this without digging right off in the kernel source. There seems to be a large amount of disinformation/incorrect info on the subject, so I hope this answers ...

I am setting up a notebook for software demo purpose. The machine has 8GB RAM, a Core i7 Intel CPU, a 128GB SSD, and runs Ubuntu 12.04 LTS 64bit. The notebook is used as a KVM host and runs a few KVM ...

I couldn't find an answer in the man pages for sysctl. My sysctl.conf file is still at it's default state, I'm testing several values and loaded new settings via sysctl -p newsettings.conf. I though ...

While searching for more ways to secure Linux servers, I found the following /etc/sysctl.conf configuration. It came as is, without much explanation. Before using it on production environment (using ...

What's the location of the sysctl.conf file on lion? In Snow Leopard it was in /etc/sysctl.conf but now that folder doesn't contain it anymore. Searching for the file in spotlight yields no results.
...

I'm experimenting with large changes to Linux system runtime parameters exposed through the sysfs virtual file system.
What is the most efficient way to maintain these parameters so that they persist ...

This was a breeze in CFEngine... But I'm in a Puppet environment now, and need to be able to assign/ensure/check certain sysctl.conf variables. In the CFEngine world, I could simply check for specific ...

I'd like to assign any number of IPv6 addresses to a Debian 6 host, but I see the following setting, and want to know what are the consquences of setting higher, or does this setting approach limits ...

Is there any settings in sysctl that controls the maximum number of connections that are allowed from any one ip address? I'm having connection issues a redis server and a rabbitmq instance and I'd ...

I'm trying to make a persistent change to sunrpc.tcp_slot_table_entries on a Linux CentOS 5.5. This value has been found important for the performance of our NFS clients, and must be set before the ...